Freezing user accounts
This feature allows you to freeze user records. Often, there are times where you might not want to deactivate a user immediately (such as when a user is part of an approval process) but you must prevent them from logging into your organization (as they have left the company, for example) while you perform the steps to deactivate them.
To freeze a user record, navigate to Setup | Manage Users | Users. Now, click on a user's name to access their user detail page. Then, click on the Freeze button.
